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1 Markets I: The Ecosystem and Exchange-Traded Markets市场在线 2 Markets II: Rates, FX and Credit市场在线 3 Markets III: Commodities, Energy and Crypto市场在线 4 Quantitative Methods方法在线 5 Derivatives and Volatility衍生品在线 6 Rates, Credit, XVA and Risk利率、信用与风险在线 7 Research Craft: Predictors, Backtests, Measurement, Portfolios研究在线 8 Strategies I: Equities and Futures策略在线 9 Strategies II: Volatility, Relative Value, Macro and the Bank Desks策略在线 10 Microstructure and Execution交易执行在线 11 Market Making and High-Frequency Trading做市在线 12 Machine Learning for Markets机器学习在线 13 Low-Latency Software技术在线 14 Networks, Hardware and Trading Infrastructure技术在线 15 Research, Data and Risk Platforms技术在线 16 The Desk and the Firm公司运营在线 17 The Industry: Firms, Roles and Careers职业发展在线 18 Interviews I: Maths, Probability and Speed职业发展在线 19 Interviews II: Markets, Trading Games and the Final Round职业发展在线 20 Interviews III: Code职业发展在线

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Earth and Space Sciences · 术语表

什么是 Parent isotope, radiogenic daughter？

又称： parent isotope · radiogenic daughter

Definition 25.1 University Earth and Space Sciences — Year 1 · 第 25 章 — Radiometric Dating Methods

In a decay system used for dating, the parent isotope is the radioactive isotope whose decay serves as the clock, and the daughter is the isotope its decay produces. The radiogenic daughter, written $D^*$ , is the part of the daughter made by the decay of the parent inside the sample since the clock started; the rest, $D_0$ , was there from the start. The number of atoms of the daughter measured today is $D = D_0 + D^*$ .

The parent and its radiogenic daughter in a closed system, as fractions of the initial number of parent atoms, against time counted in half-lives. Their sum stays equal to one; the ratio D*/P, printed at each whole half-life, doubles and adds one at each step. — The parent and its radiogenic daughter in a closed system, as fractions of the initial number of parent atoms, against time counted in half-lives. Their sum stays equal to one; the ratio $D^*/P$ , printed at each whole half-life, doubles and adds one at each step.

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